Nanomaterials
·
2018
·Vol. 8
·期 5
·275
·
IF 3.504
Jingting Lu,Chengli Jiao,Zeeshan Majeed,Heqing Jiang
Mesoporous carbons (MC) have attracted a tremendous amount of interest due to their efficient molecular transport properties. However, the limited number of active sites and low microporosity generally impede their use for practical applications. Herein, we have fabricated Mg and N co-doped mesoporous carbon (Mg-NMC) with high microporosity via one-pot synthetic route followed by further steam activation. In comparison with the parent N-doped mesoporous carbon, Mg-NMC shows partially ordered mesostructure and improved CO2adsorption capacity attributed to the introduction of basic site after Mg doping. Upon further steam activation, the microporosity is enhanced to 37.3%, while the CO2adsorption capacity is also increased by 70.4% at 273 K and 1.0 bar.Keywords:mesoporous carbon;Mg doping;steam activation;basic site;microporosity;CO2adsorption
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Mengying Sun,Yu Lei,Hao Cheng,Jianfeng Ma,Yong Qin,Yong Kong,Sridhar Komarneni
Mg doped CuO–Fe 2 O 3 composites were hydrothermally synthesized and characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy . Mg doping improved the catalytic performance of CuO–Fe 2 O 3 for phenol degradation as the removal efficiency of phenol (33 mg/L) reached up to 84.36% within 45 min using 3.2% Mg doped CuO–Fe 2 O 3 when coupled with persulfate (PS) system. The results revealed that Mg doping generated more defects (oxygen vacancies), which result in the generation of more active species during the degradation process. The influence of catalysts and PS dosages were investigated to obtain the optimum conditions. The effects of pH and dissolved oxygen were also evaluated. Increase of solution pH was found to be beneficial for the removal of phenol because of reduced copper leaching at higher pH. However, decrease in dissolved oxygen concentration retarded the degradation of phenol because of the reduced production of O 2 • - . Based on the quenching experiments and ESR experiments, 1 O 2 , O 2 • - , ·OH and ·SO 4 − were confirmed as the active species in the phenol degradation process and a phenol degradation pathway was proposed. Other contaminants such as nitrobenzene (NB), P-nitrophenol (PNP) and P-Chlorophenol (4-CP) could also be removed to some extent using the present catalyst system.
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
Biomedical Materials
·
2024
·Vol. 19
·期 4
·045026
·
IF 3.9
Yewen Zhong,Cong Liu,Xin Yan,Xiangdong Li,Xiaofeng Chen,Sui Mai
This study aimed to investigate the effects of magnesium-doped bioactive glass (Mg-BG) on the mineralization, odontogenesis, and anti-inflammatory abilities of human dental pulp stem cells (hDPSCs). Mg-BG powders with different Mg concentrations were successfully synthesized via the sol-gel method and evaluated using x-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy. Apatite formation was observed on the surfaces of the materials after soaking in simulated body fluid. hDPSCs were cultured with Mg-BG powder extracts in vitro, and no evident cytotoxicity was observed. Mg-BG induced alkaline phosphatase (ALP) expression and mineralization of hDPSCs and upregulated the expression of odontogenic genes, including those encoding dentin sialophosphoprotein, dentin matrix protein 1, ALP, osteocalcin, and runt-related transcription factor 2. Moreover, Mg-BG substantially suppressed the secretion of inflammatory cytokines (interleukin [IL]-4, IL-6, IL-8, and tumor necrosis factor-alpha). Collectively, the results of this study suggest that Mg-BG has excellent in vitro bioactivity and is a potential material for vital pulp therapy of inflamed pulps.
研究领域:
牙科学
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材料科学
·
细胞生物学
✓ 已验证
DOI
高影响因子
Small
·
2025
·Vol. 21
·期 19
·2411490
·
IF 12.1
Yujia Zhang,Fuliang Guo,Ao Li,Zhixiong Li,Pengcheng Yuan,Jing Xu,Zhiwei Hu,Liang Yin,Huiling Zhao,Ying Bai,Hong Li
Heteroatoms doping would validly stabilize the structure of Li-rich material and elevate electrochemical performance. For the synthesized Li-rich material, the conventional ex situ doping strategy can only incorporate heteroatoms in the outer particles, diminishing benefits for the internal structure of secondary particles. Recently, in situ doping has been employed to influence topological lithiation and achieve well-distribution in the bulk structure. However, the mechanisms of in/ex situ doping on elevating electrochemical performance for Li-rich material are ambiguous. Herein, by introducing magnesium (Mg 2+ ) ions on the precursor and synthesized Li-rich material, the in situ Mg doping (LRO-Mg1) and the ex situ Mg doping (LRO-Mg2) samples are successfully designed. Characterizations shows that Mg ion tend to incorporate into the Li-rich bulk structure for in situ doping, while they enrich in the surface for ex situ doping. Electrochemical measurement manifest that the in situ Mg doping Li-rich cathode exhibits more elevated high-rate performance, while the ex situ doping Li-rich cathode exhibits more elevated specific capacity, illuminating that enhances bulk structure of Li-rich cathode through in situ doping strategy is more effective than the surface modification (ex situ doping). Ex situ doping may be more effective for surface treatment, contributing to specific capacity improvement.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Jiaxin Ou,Wenqing Xu,Ye Sun,Honghai Zhang,Yuchao He,Zongyi Wen,Yachun Lu,Jianwen Yang,Quanqi Chen
Potassium vanadium phosphate (K 3 V 3 (PO 4 ) 4 ) has emerged as one of the most promising cathode candidates for potassium-ion batteries because of exceptionally stable structural framework, yet suffers from intrinsic poor electronic conductivity characteristic of polyanionic compounds. Herein, a strategic Mg 2+ doping approach was adopted to prepare Mg-doped K 3 V 3 (PO 4 ) 4 /C (K 3+x V 3-x Mg x (PO 4 ) 4 /C, x = 0.1, 0.2 and 0.3) composites, where larger Mg 2+ (0.72 Å) substitution for V 3+ (0.64 Å) effectively widens K + diffusion pathways. Optimal doping of Mg 2+ significantly elevates K + diffusion, rate capability, and cyclability beyond undoped K 3 V 3 (PO 4 ) 4 /C. The optimal K 3.2 V 2.8 Mg 0.2 (PO 4 ) 4 /C (Mg0.2-KVP/C) demonstrates comprehensive performance enhancements over pristine K 3 V 3 (PO 4 ) 4 /C, exhibiting 16.5 % higher initial discharge capacity (67.0 vs. 57.5 mAh g −1 ) at 1C with significantly improved cycling stability (85.8 % vs. 65.5 % capacity retention after 150 cycles). Notably, Mg0.2-KVP/C maintains 63.8 % larger capacity at 5C rate (53.4 vs. 32.6 mAh g −1 ) while achieving capacity retention of 75.2 % after 1000 cycles-representing a 50 % improvement in long-term cycle stability compared to the undoped K 3 V 3 (PO 4 ) 4 /C. The significant improvement in electrochemical performance of K 3 V 3 (PO 4 ) 4 /C upon Mg doping suggests that strategic ionic doping is an effective strategy for improving potassium storage performance of K 3 V 3 (PO 4 ) 4 /C and other polyanionic compounds for potassium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Ke Xue,Changkun Cai,Manyi Xie,Shuting Li,Shengli An,Hong Yang
PrBaFe 2 O 5+ δ (PBF) is one of the promising cathode materials for intermediate-temperature solid oxide fuel cell (IT-SOFC) technology. However, as the operating temperature decreases, the electrochemical performance of this material deteriorates rapidly. To counter this, various doping strategies have been tested and reported in order to improve the electrochemical properties of this material at intermediate-temperatures. In this study, Mg-doping to partially substitute Fe of PBF was investigated. PrBaFe 2– x Mg x O 5+ δ (PBFMg x , x =0.1, 0.15, 0.2, 0.3) materials were successfully synthesized, and their electrochemical performance as IT-SOFC cathode was evaluated. It is shown that Mg-doping enhances the conductivity of PBF between 650–800 °C, impacts little on the area-specific resistance of oxygen reduction reaction at and above 700 °C, and, most significantly, improves the power density of the Ni-SDC/SDC/PBFMg 0.15 single cell by 52% compared to the un-doped PBF. This enhanced electrochemical performance is attributed to the improvement in PBF conductivity by Mg-doping.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Photonics
·
2018
·
IF 6.88
Fei Chen,Zhenyang Liu,Zhongyuan Guan,Zheming Liu,Xu Li,Zhenbo Deng,Feng Teng,Aiwei Tang
Colloidal ZnO nanoparticles (NPs) are widely used as an electron-transporting layer (ETL) in the solution-processed quantum-dot light-emitting diodes (QD-LEDs). However, the inherent drawbacks including surface defect sites and unbalanced charge injection prevent the device from realizing their further performance enhancement. In this work, a series of Mg doped ZnO (ZnO:Mg) and chloride-passivated ZnO (Cl@ZnO) NPs were synthesized by using a solution-precipitation strategy, and they exhibited tunable optical bandgaps and upward-shift of conduction-band maximum (CBM). Solution-processed QD-LEDs based on cadmium-free Cu-In-Zn-S/ZnS (CIZS/ZnS) nanocrystals (NCs) were fabricated by using ZnO:Mg and Cl@ZnO NPs as the ETLs, whose maximum peak external quantum efficiency (EQE) was nearly twice as high as that of QD-LEDs using ZnO NPs as the ETL (EQE = 1.54%). To take advantage of the benefits of ZnO:Mg and Cl@ZnO NPs, Cl@ZnO:Mg NPs were developed through the integration of Mg doping and Cl-passivation. Surprisingly, the cadmium-free QD-LEDs with the Cl@ZnO:Mg NPs as the ETL exhibited a maximum peak EQE of 3.72% and current efficiency of 11.08 cd A–1, which could be enhanced to be 4.05% and 12.17 cd A–1 by optimizing the Cl amount, respectively. The positive effects of the Mg doping and Cl-passivation on the cadmium-free QD-LEDs are primarily ascribed to the reduced electron injection barrier of ETL/the emitting layer interface and slower electron mobility, which can be verified by the ultraviolet photoelectron spectroscopy (UPS) measurements and current density–voltage characteristics of electron-only devices.
研究领域:
材料科学
·
光电领域
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jiatai Wang,Yan Tan,Xi Wen,Hongyun Liu,Chao Fan,Yibo Zhang,Yuan Xu,Xingyu Zhao,Mengting Li,Jian Li,Jingfu Hu
Sodium-ion batteries (SIBs) have emerge as promising alternatives to lithium-ion batteries (LIBs), attributed to their abundant sodium resources and economical pricing. Among various cathode materials , P2 and O3-type layered oxides have garnered significant attention for their superior electrochemical properties . In this study, NaNi 0.5 Mn 0.45 Mg 0.05 O 2 (P2/O3-NMM) cathode material was effectively synthesized using a homogeneous coprecipitation technique with di-n-butylamine as the precipitating agent. The findings indicate that the P2/O3-NMM cathode material synthesized at 850 ℃ for 16 h exhibits a capacity retention of 62.33 % after 200 cycles at a current density of 1 C. The results indicate the biphasic synergy of P2/O3 integrates the rapid Na + migration of the P2 phase with the high capacity of the O3 phase, substantially improving cathode electrochemical performance . This work provides an effective strategy for developing biphase cathodes in SIBs.
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Mehrab Pourmadadi,Amir Reza Hafezi,Roya Yaghoobi,Aynaz Rahmaninodeh,Negin Hosseini,Afshin Alibabaie,Narges Ajalli,Elaheh Babajani Afrouzi,Mahdi Shirazi,Azam Ghadami
This research examines the formulation and characterization of a pH-sensitive nanocarrier for the targeted and controlled release of curcumin (Cur) in the treatment of brain cancer. The nanocarrier consists of gelatin (G), agarose (Aga), and magnesium-doped carbon quantum dots (Mg-CQD), produced by a water-in-oil-in-water (w/o/w) double emulsification method. These materials demonstrate pH responsiveness, biocompatibility, and biodegradability, crucial for addressing Cur's limitations, including inadequate solubility and fast metabolism. In vitro cytotoxicity assays on U-87 MG glioma cells showed a 49 % reduction in cell viability, whereas minimal toxicity was observed in L929 fibroblast cells, indicating selective anticancer potential. The nanocarrier exhibited a regulated and extended release of Cur under acidic conditions, achieving encapsulation and loading efficiencies of 45.75 % and 85.5 %, respectively, hence enhancing its bioavailability and therapeutic efficacy. Characterization confirmed uniform nanoparticle distribution (average size: 193.5 nm; zeta potential: −42 mV) and successful drug encapsulation. FTIR, XRD and FE-SEM tests validated the effective drug encapsulation, uniform distribution of nanoparticles, and stability. The findings underscore the nanocarrier's potential for targeted cancer therapy, providing both therapeutic efficacy and safety, with intriguing applications in nanomedicine.
研究领域:
生物医学工程
·
药剂学
·
肿瘤学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 21
·8374-8383
·
IF 8.262
Liangbin Xiong,Minchao Qin,Guang Yang,Yaxiong Guo,Hongwei Lei,Qin Liu,Weijun Ke,Hong Tao,Pingli Qin,Songzhan Li,Huaqing Yu,Guojia Fang
Mg doping into high temperature processed (HTP) SnO2 as an electron selective layer (ESL) significantly improves perovskite solar cell (PSC) performance including power conversion efficiency (PCE), open circuit voltage, short circuit current (JSC) and fill factor. An optimum Mg content (7.5%) affords a uniform, smooth and dense Mg-doped SnO2 film with high electron mobility and its corresponding PSC displays less hysteresis and achieves a highest steady-state PCE of 14.55%, nearly 92.8% enhancement compared to that with undoped SnO2. Electrical measurements show that suitable Mg doping dramatically reduces free electron density and substantially increases the electron mobility of pristine SnO2. The mechanism of efficiency enhancement for PSCs is proposed as follows: the low free electron density causes suppression of carrier recombination and high electron mobility facilitates fast extraction of electrons from perovskite to ESLs, contributing to an improved JSC. Impedance analysis strongly supports the proposed mechanism and reveals that the higher is the electron mobility, the higher is the electron collection efficiency, and the higher are the JSC and PCE. The HTP SnO2 with a suitable Mg content can be an excellent ESL for PSCs and might well be a suitable candidate of ESLs for CdTe, CuInGaSe and other photovoltaic devices involved in HTP treatment.
研究领域:
材料科学
·
能源技术
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yao Lu,Carlos Alberto López,Jie Wang,José Antonio Alonso,Chunwen Sun
Na 0.5 Bi 0.5 TiO 3 (NBT) and its acceptor-doped perovskites , as lead-free piezoelectric materials before, have been found to be excellent oxygen-ion conductors with potential applications in intermediate-temperature solid oxide fuel cells (SOFCs). Among them, the Bi deficient and B-site Mg doped sodium bismuth titanate (Na 0.5 Bi 0.49 Ti 0.98 Mg 0.02 O 2.965 , NBTM) exhibits a remarkable oxygen ionic conductivity . Here, we report a structural analysis on NBT and NBTM ceramics using high-temperature in situ neutron diffraction (NPD) to gain insight into the effects of Mg doping on ionic conductivity and structure. Both perovskite oxides exhibit two consecutive phase transformations from R 3 c to P 4 bm at ∼400 °C and from P 4 bm to Pm 3 ¯ m at ∼600 °C. The effects of Bi deficiency and Mg substitution on oxygen vacancy concentration and ion displacements are revealed. In addition, a NBTM supported single cell consisting of Ag-NBTM cathode and Ni-NBTM anode is fabricated to evaluate the possibility of its application in intermediate-temperature SOFCs. The structural stability of NBTM is still a major concern that hinders its utilization at high temperature and under reducing atmosphere.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 40
·19491-19500
·
IF 3.925
Xiabing Hu,Lidong Zhang,Shuyu Li,Jiayan Chen,Baoying Zhang,Zhiyuan Zheng,Hongyu He,Shiping Luo,Aijuan Xie
Layered double hydroxides (LDHs) are one of the ideal functional materials for the oxygen evolution reaction (OER) because of their special configuration and good electrochemical activity. Incorporating different divalent and trivalent metals into layered double hydroxides (LDHs) is an effective way to induce defects and generate abundant oxygen vacancies and adjust the morphology of the materials and thus enhance the intrinsic catalytic activity of the materials. In this work, a nano-flower-like Mg-doped NiCo-LDH (denoted as NiCoMg-LDH) was synthesized by a solvothermal method, and the effect of the molar ratio of Mg, Co and Ni on the electrochemical activity of NiCoMg-LDH was explored. The results showed that NiCoMg-LDH with the optimum molar ratio (Ni : Co : Mg = 3 : 3 : 0.3) exhibited excellent OER catalytic activity in 1.0 M KOH, with an overpotential of only 229 mV at a current density of 10 mA cm−2, a small Tafel slope of 31.0 mV dec−1, and an electrochemically active surface area (ECSA) of 410 cm2. This work provides a facile but effective method to improve the OER performance of layered double hydroxides.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）